QNX: fixed compilation of auto test

Compilation failed because "open" is defined as "open64" in fcntl.h.
This definition is reverted now.

Change-Id: I9badcf11131320c53e442cd5b8b21bb5aa4efee5
Reviewed-by: Fabian Bumberger <fbumberger@rim.com>
Reviewed-by: Peter Hartmann <phartmann@blackberry.com>